.md-typeset h1 {
  font-weight: bold;
  color: #000;
  border-bottom: solid 2px purple;
  padding-bottom: 5px;
}
.md-typeset h2 {
  font-weight: bold;
  border-bottom: solid 1px #000000;
}
.md-typeset h3 {
  border-bottom: 1px dotted #888;
}